From the following data, calculate the population in the year 1985:
| Year | Population (in , 000) |
| 1971 | 12 |
| 1981 | 15 |
| 1991 | 20 |
| 2001 | 27 |
| 2011 | 49 |
To calculate the population in 1985, we can use the method of linear interpolation between the given data points for the years 1981 and 1991. The given population data for these __________ __________ ______ ______ _____.
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